Add code coverage for scrutinizer

Author: lisiy50

.github/workflows/push.yml

@@ -41,7 +41,7 @@ jobs:
           composer install --no-progress --prefer-dist --optimize-autoloader
 
       - name: Run PHPUnit
-        run: php vendor/bin/phpunit
+        run: php vendor/bin/phpunit --coverage-clover=coverage.clover && wget https://scrutinizer-ci.com/ocular.phar && php ocular.phar code-coverage:upload --format=php-clover coverage.clover
 
   phpunit:
     runs-on: ${{ matrix.operating-system }}